138 



ECHINODERMATA. 



No. 416. Cidaris glandifera, Goklf. 



Spines. The spines of this species are called " Jew-stones" 

 by tlie Pilgrims, who bring them in large numbers from the 

 Holy Land. They are pyriform, and covered with granules. 

 From the Jurassic ('?), Mount Carmel, Palestine. 



No. 417. [771, Cast]. Cidaris Suevica, Desor. 



A distinctive feature in this Urchin is a double row of granules of unequal 

 size along the ambulacra. From the Middle Oolite, Wurtemberg. 



No. 418. Clypeaster Ghizehensis, 



^ii^^^lll0immmmimmmmmtiiilliM 

 bulacral portion is much elevated. 



This genus, one of the true Clypeas- 

 tnd<e, includes the largest of sea-urchins. 

 The shell is oblong; mouth angular and 

 furnished with well developed teeth; 

 tubercles'mere granules, and the spines 

 proportionally small. The shell of this 

 species is subpentagonal, and the am- 

 From the Eocene Tertiary, Ghizeh, Egypt. 



No. 419. [814, Cast]. Clypeaster umbrella, Agass. 



This inflated form, with iuterambulacra rising into ribs, is from the Miocene 

 Tertiary, Sardinia, and belongs to the Ward Collection, University of Roch- 

 ester. This genus of the buckler-shaped group includes the largest of sea- 

 urchins. The mouth is armed with well developed teeth. 



No. 420. Cyphosoma Texana. 



Cretaceous, Lampasas Co., Texas. 



No. 421. Discoidea subuculus, Leske. 



This Echinus has a hemispherical test, and very 

 small tubercles arranged in concentric series. From 

 the Upper Greensand (Cretaceous) of Yonne, France. 



No. 422. Echinobrissus (Nucleolites) scutatus, Gmel. 



Two SPECIMENS. This genus is a section made at 

 the expense of NucUolites, to include those shortened 

 and square forms with united poriferous zones. From 

 the Coral Rag (Middle Oolite) of Weymouth, England. 



